diff --git a/scripts/advanced.php b/scripts/advanced.php
index 765016c..fd484d4 100644
--- a/scripts/advanced.php
+++ b/scripts/advanced.php
@@ -196,6 +196,15 @@ if (isset($_GET["max_files_species"])) {
     $contents = preg_replace("/RAW_SPECTROGRAM=.*/", "RAW_SPECTROGRAM=0", $contents);
   }
 
+  if(isset($_GET["rare_species_threshold"])) {
+    $rare_species_threshold = $_GET["rare_species_threshold"];
+    if(strcmp($rare_species_threshold, $config['RARE_SPECIES_THRESHOLD']) !== 0) {
+        $contents = preg_replace("/RARE_SPECIES_THRESHOLD=.*/", "RARE_SPECIES_THRESHOLD=$rare_species_threshold", $contents);
+    }
+  } else {
+      $contents = preg_replace("/RARE_SPECIES_THRESHOLD=.*/", "RARE_SPECIES_THRESHOLD=30", $contents);
+  }
+
   if(isset($_GET["custom_image"])) {
     $custom_image = $_GET["custom_image"];
     if(strcmp($custom_image,$config['CUSTOM_IMAGE']) !== 0) {
@@ -434,6 +443,10 @@ foreach($formats as $format){
       <label for="raw_spectrogram">Minimalist Spectrograms: </label>
       <input type="checkbox" name="raw_spectrogram" <?php if($newconfig['RAW_SPECTROGRAM'] == 1) { echo "checked"; };?> ><br>
       <p>This allows you to remove the axes and labels of the spectrograms that are generated by Sox for each detection for a cleaner appearance.</p>
+
+      <label for="rare_species_threshold">Rare Species Threshold (days): </label>
+      <input type="number" name="rare_species_threshold" min="1" value="<?php echo isset($newconfig['RARE_SPECIES_THRESHOLD']) ? $newconfig['RARE_SPECIES_THRESHOLD'] : 30; ?>"><br>
+      <p>This setting defines after how many days since last detection a species is considered rare. Default is 30 days.</p>
       </td></tr></table><br>
 
       <table class="settingstable"><tr><td>